Error on debug node

[jianlao8]

Hi,

I am using Node-red 2.2. I created a simple flow by use inject, python-function and debug nodes. Flowing code is in the python-function node:

import yfinance as yf

df = yf.download("AAPL", start="2021-12-01", end="2022-02-01")
msg['payload'] = df.tail()

return msg

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It runs fine in a python file. But I got errors on debug node in Node-Red.
One of the error is following:

Traceback (most recent call last):
File "", line 75, in

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Could you help to resolve the issue?

Thank you so much!